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PCE-WM 1 humidity
detector
measures
absolute and relative humidity in
% and g/m³,
ambient temperature, dew point with an external
sensor |
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The PCE-WM 1 humidity detector
has a wide range of uses and can determine
relative humidity in % and absolute
humidity in g/m³
to a high degree of accuracy. With this humidity
detector ambient conditions can be
measured, such as relative humidity and
ambient temperature, and can also measure
surface temperature with an external sensor
which comes with the device. The humidity
detector can also calculate dew point and
can also calculate relative humidity in g/m³.
This device is used extensively in the
construction sector or in the food industry
to develop new products and ensure quality
and freshness. The humidity detector comes
calibrated from the manufacturer but is
uncertified. A DIN ISO calibration from an
accredited laboratory can be ordered,
please contact to enquire. We can
perform an annual recalibration to meet ISO
standards. Here you will
find an overview from which to choose the best
humidity detector to suit your needs. |
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- Measure humidity and ambient temperature
using
an external temperature sensor and an
external sensor for measuring surface tempera-
true
- Shows absolute and
relative humidity in % or
g/m³ and temperature
- Determines dew point
- ISO 9000 laboratory calibration and
certificate
(optional)
- Minimum, maximum values
and Peak Hold
- Designed for the food industry
to control am-
bent conditions and for ventilation problems in
buildings
View or print the user's manual
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PCE-WM 1 humidity detector |
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Technical
specifications (the same for both devices) |
Measurement range
Temperature
Relative humidity
Absolute humidity
Dew point temperature |
0 to 50°C
10 to 95% r.h.
0.5 to 74.4g/m³
-27.3 to 47.9°C |
Resolution Temperature
Relative humidity
Absolute humidity |
0.1°C
0.1%
0.1g/m³ |
Precision
Temperature
Relative humidity
Absolute humidity |
±1K
±3%
±2% |
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Response time |
approx. 10 s |
| Minimum, Maximum
values and Peak Hold |
yes |
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External temperature sensor |
1.1m cable |
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Power |
9V battery |
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Operating conditions |
-20 to 50°C / 0 to 100% r.h. |
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Dimensions (device) |
165 x 80 x 33mm |
| Dimensions (sensor) |
150 x 30mm (ambient temperature /
humidity)
50 x 30mm (surface temperature) |
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Weight |
380g |
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Dew point / Dew point temperature |
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Dew point temperature is defined as
the actual content of water vapour in the air found at the
maximum level
(100%
of relative humidity of air). Dew point is
therefore an independent measure from the actual temperature.
One way of measuring dew point is freezing a
metal pipe until moisture forms on its surface. When water
vapour appears, the metal has reached dew point temperature. The
most common of measuring this uses a wet thermometer together
with a dry thermometer. The wet thermometer shows dew point and
with the ambient temperature, relative humidity can be
determined. This device deos this calculation automatically. |
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Relative humidity /
Absolute humidity in %
or g/m³ |
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The
expression "relative humidity" represents the degree of relative saturation of air, which is to
say at which percentage is given the maximum saturation of air
moisture at this temperature. The scientific definition of "relative
air humidity" refers to the relationship
of the partial pressure of water vapour with respect the to
pressure of water saturation. The word air doesn't appear in the
definition as relative air humidity is totally independent from
the existing quantity of nitrogen or of oxygen. The pressure of
the vapour of saturation of the water vapour in the space is
equal to a high atmospheric pressure. To show if the air is dry
or humid, following relative air humidity, one decisive factor
of absolute humidity is air in grammes of water per kilogram
of air. In certain volumes, air humidity in absolute terms can
be shown in g/m³. This image shows the
relationship between relative humidity, absolute humidity and
temperature:
The PCE-WM 1 humidity
detector introduces the concepts in the graphic above. The
device determines relative humidity, ambient temperature,
surface temperature and calculates dew point and air water
content in g/m³. These values can be seen on the display with the help of the
selecting dial. The humidity detector can be recalibrated and
certified to meet ISO standards, and thanks to the devices
accuracy, will provide the same results. |
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Contents
PCE-WM1 humidity detector, external combined
sensor (for ambient temperature and relative humidity), external
sensor for surface temperature, battery, carrying case and
user's manual |
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Optional accessories |
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ISO laboratory
calibration certificate
For companies that wish to incorporate the
device into their array of internal quality control tools or for
annual recalibrations (if not using the calibration kit).
The ISO certificate includes a calibration and a
document containing all the readings taken. |
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Replacement combined sensor
The combined sensor comes with the device (measures
ambient temperature and relative humidity) can be recalibrated
numerous times. After some years of use, it can be replaced with
a substitute sensor. |
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Replacement surface temperature sensor
If the surface temperature sensor that comes with the the
humidity detector can eventually fail a replacement can be
ordered when required. |
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Here you will find an overview of all the measuring instruments available at PCE Group. |
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Contact:
Companies House England
Tursdale Business Park
Co. Durham - DH6 5PG
United Kingdom
Phone. +44 ( 0 ) 191 377 3398
Fax +44 ( 0 ) 191 377 3357 |
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